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Catalytic Behavior and In Situ X‐Ray Diffraction of Promoted Iron Catalysts for Fischer‐Tropsch Synthesis
Author(s) -
Wen Ruoxi,
Thiessen Johannes,
Jess Andreas
Publication year - 2022
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.202200056
Subject(s) - fischer–tropsch process , catalysis , phase (matter) , in situ , carbide , materials science , x ray crystallography , chemistry , diffraction , crystallography , chemical engineering , metallurgy , selectivity , organic chemistry , physics , optics , engineering
The effects of structural promoters (ZnO, SiO 2 , and Al 2 O 3 ) on the phase transformation during reduction and Fischer‐Tropsch synthesis (FTS) of a FeCuK catalyst were investigated by in situ X‐ray diffraction and the FTS catalytic performance was studied in a fixed‐bed reactor. The reduction follows the path of Fe 2 O 3 /K 2 Fe 22 O 34 → Fe 3 O 4 → α ‐Fe. The addition of ZnO, SiO 2 , and Al 2 O 3 delayed and prolonged the reduction. The iron carbides formed under reaction conditions were χ ‐Fe 5 C 2 and ε ‐Fe 2 C. The presence of ZnO, SiO 2 , and Al 2 O 3 favored the formation of χ ‐Fe 5 C 2 . ε ‐Fe 2 C is a more active phase. Besides, ε ‐Fe 2 C seems to favor the formation of CO 2 and C 5+ and χ ‐Fe 5 C 2 benefits CH 4 and C 2 –C 4 products.